Renewable fuse plug



Feb. 23, 1932. w. H. RUMBLE 1,846,660

RENEWABLE FUSE PLUG Filed July 30, 1928 msmxmwmw:

Z/Vl/E/V TOR. 9

Zal/AL TERE RUM/ E- T EK Patented Feb. 23, 1932 UNITED STATES PATENT OFFlCE WALTER, H. RUMBLE, OF LOS ANGELES, CALIFORNIA, ASSIGNOR OF ONE-HALF T P. G. MARTIN, OF LOS ANGELES, CALIFORNIA RENEWABLE FUSE PLUG Application led .Tuly 30, 1928.

My invention relates to a renewable fuse plug, and has for its principal obj ect the provision of a relatively simple, practical and inexpensive fuse plug having relatively few parts Which enables the plug to be easily and cheaply manufactured and marketed.

Further objects of my invention are to improve upon and simplify the construction of the existing forms of renewable fuse plugs,

to provide a fuse plug wherein the outer shell or housing is devoid of all metal, thereby minimizing the danger' of injuries due to shocks While the plug is being placed in position for use or removed therefrom, and, fun ther to provide a plug wherein the metal terminals or contact members are imbedded in the ends of the core or carrier, thereby providing a very strong and durable construction.

A further object of my invention is to pro-- vide renewable fuse plug wherein the shell or housing and the core or carrier may be very securely clamped or locked to each other when assembled for use.

lith the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts that vvill hereinafter be more fully described and claimed and illustrated in the acecmpanying drawings, in which Fig. 1 is a perspective view of a renewable fuse plug constructed in accordance with my invention.

Fig. 2 is an end elevational view of the fuse plug.

Fig. 3 taken on Fig. 4

a vertical longitudinal section line 3--3 of Fig. 1..

is a side elevational view of the core or carrier of the fuse plug.

Fig. 5 is a top plan view of the core.

Fig. 6 is a plan view of one of the metal terminals or contact members that are carried by the ends of the core or carrier.

Referring by numerals to the accompanyis the ing drawings which illustrate a practical em` bodiinent of my invention, 10 designates the body of the core or carrier, which body is preferably formed of bakelite or analogous insulating material, the end portions 11 of said core being substantially cylindrical in Serial No. 296,1i8.

i "ers 14, the same beingpreferably stamped from copper plates, and the inner portions of these contact plates or terminals are provided in their opposite edges vith notches lVlic-n the contact plates are properly imbedded in the ends of the carrier the outer portions of these notches eX- tend beyond the ends of the body of the carrier and thus the shoulders 16 at the outer ends of said notches occupy positions a short distance beyond the outer faces of the cylindrical end portions 1l of the carrier.

Projecting from the side edges of the plates 14 inwardly from the notches 15 are lu s i? which materially assist in providing firm anchorage for the inner portions of the contact plates When the same are imbedded in the ends of the carrier.

Formed through the inner end portions of the contact plates 14 are apertures 18 Which are for the reception of the shanks of screws 19, which latter are utilized for detachably securing the fuse link 20 upon the core or carrier.

When the contact plates 14 are properly imbedded in the ends of the core or carrier the upper surfaces of the inner portions of said contact plates lie iiush with the bottom surfaces of the recesses 13 and thus when a fuse link such as 2O is poitioned on the cene trai portion of the core or carrier so as to span the intermediate recess 1Q the ends of said link make direct contact With the eX- posed inner end portions of the contact plates and said link is firmly secured to the core 0r inner portions of metal terminals or A l bakelite or similar insulating material, the chamber within which tubular body is of such size as to snugly receive the core or carrier l0.

One end of the tubular housing 21 is provided with an inwardly projecting flange 22 and formed therein at diametrically opposite points are notches 23 which permit the contact plate le on the inserted end of the core or carrier to pass beyond the flange 22 when the parts of the plug are properly assembled and when the core is properly positioned within the shell or housing the outer portions of the notches l5 are in registration with the flange 22.

Formed on the outer face of the flange 22 immediately adjacent to the inner edge thereof between the notches 23 are slightly inclined cam surfaces 24e.

Y Due to the arrangement of these cam surfaces the two parts of the plug may be very 'tightly clamped or secured to each other and which eii'ect is produced by rotating the shell or housing 2l upon the core after the latter has been inserted in the shell, and as a result of such rotation the shoulders 16 will ride upon the cam surfaces 2li, thereby imparting slight relative longitudinal movement between the two parts of the device and consequently very securely locking or clampingl the same to each other.

rl`hus it will be seen that l have provided a renewable fuse plug that is relatively simple in construction, inexpensive of manufacture, capable of being easily and quickly assembled and taken apart and all parts of which plug, with the'exception of the contact plates or terminals, are formed of insulating material, thereby minimizing the danger of injuries due to electrical shocks while the plug is being placed in service or removed therefrom.

Due to the few parts utilized in my improved plug and the absence of special metal ttings the plug may be very economically produced and marketed. Y

lt will be understood that minor changes in the size, form and construction of the various parts of my improved'renewable fuse plug may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

l claim as my invention:

l; In a'renewable fuse plug, a substantially tubular housing, a fuse carrier removably positioned within said housing, said housing and carrier'being wholly formed of insulating material, contact plates having their inner ends imbedded in the ends of the car rier, and means on one end of the housing and on one of the contact plates for effecting interlocking engagement between said housing and carrier as a result of relative rotary movement of said housing or carrier.

2. In a renewable fuse plug, a substantially tubular housing, a fuse carrier adapted to be inserted within said housing, contact plates imbedded in and projecting from the ends of said carrier, and means on one end of said housing and one Vof said plates and adapted when relatively rotated to clamp the carrier and housing to each other when said carrier is inserted in said housing.

3. In a renewable fuse plug, a carrier, contact plates having notched inner portions that are imbedded in the ends of the carrier, a fuse link connecting the inner portions of said contact plates, means for securing said fuse link to said contact plates, a tubular housing adapted to receive said carrier, and cooperating shoulders formed on one end of said tubular housing and one of said Contact plates for clamping said housing and carrier to each other upon relative rotary movement thereof. y e

el. lin a renewable fuse plug, a carrier, contact plates having notched inner portions that are imbedded in the ends of the carrier, fuse link connecting the inner portions of said contact plates, means for securing said fuse link to said Contact plates, a tubular housing adapted to receive said carrier, and means on the end of said tubular housing and one of said contact plates for edecting interlocking engagement between said housing and carrier.

In testimony whereof I affix my signature.

TWAL'ER H. RUMBLE. 

